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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     "Chang S. Bae" <chang.seok.bae@intel.com>,
        linux-kernel@vger.kernel.org, x86@kernel.org, bp@alien8.de,
        dave.hansen@linux.intel.com, mingo@redhat.com
Cc:     yang.zhong@intel.com, ravi.v.shankar@intel.com,
        chang.seok.bae@intel.com, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4 2/2] selftests/x86/amx: Update the
 ARCH_REQ_XCOMP_PERM test
In-Reply-To: <20220129173647.27981-3-chang.seok.bae@intel.com>
References: <20220129173647.27981-1-chang.seok.bae@intel.com>
 <20220129173647.27981-3-chang.seok.bae@intel.com>
Date:   Wed, 23 Mar 2022 17:44:59 +0100
Message-ID: <8735j8aa9g.ffs@tglx>
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On Sat, Jan 29 2022 at 09:36, Chang S. Bae wrote:
> Update the arch_prctl test to check the permission bitmap whether the
> requested feature is added as expected or not.
>
> Every non-dynamic feature that is enabled is permitted already for use.
> TILECFG is not dynamic feature. Ensure the bit is always on from
> ARCH_GET_XCOMP_PERM.

Running it on a machine which does not have AMX results in:

 amx_64: [FAIL]	xstate cpuid: invalid tile data size/offset: 0/0: Success

It's not a failure, really. Selftests are supposed to run on all
machines and the proper thing to do if a hardware feature is not
available is to SKIP the test and return 0.

Thanks,

        tglx